This is it! He took out from his bag, sit down with me in a park bench and said..
Little-big-boss Uto: ママ、いつもいろいろしてくれて、ありがとう！うんでくれてありがとう！(Mommy, thank you for always taking care of me! Thank you for giving birth to me!)

He probably learned this phrase from his teacher, but still! the situation, with him saying out to me clearly but shyly, it was like the cutest speech ever for me

Hugssssss

The present Little-big-boss Uto made
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.At night, Little-big-boss Uto gave me a letter with a box of treat he bought together with daddy.
“Dear mommy, thank you for always taking care of me! From Yuto”

The very delicious dorayaki in the box~
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And of course not to forget, though he is still not aware of what’s a Mother’s day is,